The Paleobiology Database

Basic info	Taxonomic history	Classification	Relationships
Morphology	Ecology and taphonomy	Map	Age range and collections

Hypasteroceras

Taxonomy

Hypasteroceras was named by Spath (1923).

It was assigned to Ammonoidea by Spath (1926); and to Hypasteroceratinae by Howarth (2013).

Species

Synonyms

Asaphoceras is a genus. It is not extant.

It was synonymized subjectively with Hypasteroceras by Howarth (2013).

It was assigned to Ammonoidea by Sepkoski (2002).
Cancelliceras was named by Venturi and Nannarone (2002).

It was synonymized subjectively with Hypasteroceras by Howarth (2013).
Oxydiscoceras was named by Venturi and Nannarone (2003).

It was synonymized subjectively with Hypasteroceras by Howarth (2013).
Oxydiscus was named by Venturi and Nannarone (2002).

It was replaced with Oxydiscoceras by Howarth (2013).

Synonymy list

Year	Name and author
1923	Hypasteroceras Spath
1926	Hypasteroceras Spath
2002	Asaphoceras Sepkoski, Jr.
2002	Oxydiscus Venturi and Nannarone
2002	Cancelliceras Venturi and Nannarone p. 157
2003	Oxydiscoceras Venturi and Nannarone p. 323
2013	Hypasteroceras Howarth p. 28

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